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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Assertions.h"
#include "js/LocaleSensitive.h"
#include "nsIObserver.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/intl/LocaleService.h"
#include "mozilla/Preferences.h"
#include "xpcpublic.h"
using namespace mozilla;
using mozilla::intl::LocaleService;
class XPCLocaleObserver : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
void Init();
private:
virtual ~XPCLocaleObserver() = default;
};
NS_IMPL_ISUPPORTS(XPCLocaleObserver, nsIObserver);
void XPCLocaleObserver::Init() {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
observerService->AddObserver(this, "intl:app-locales-changed", false);
Preferences::AddStrongObserver(this, "javascript.use_us_english_locale");
}
NS_IMETHODIMP
XPCLocaleObserver::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!strcmp(aTopic, "intl:app-locales-changed") ||
(!strcmp(aTopic, "nsPref:changed") &&
!NS_strcmp(aData, u"javascript.use_us_english_locale"))) {
JSRuntime* rt = CycleCollectedJSRuntime::Get()->Runtime();
if (!xpc_LocalizeRuntime(rt)) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
return NS_ERROR_UNEXPECTED;
}
/**
* JS locale callbacks implemented by XPCOM modules. These are theoretically
* safe for use on multiple threads. Unfortunately, the intl code underlying
* these XPCOM modules doesn't yet support this, so in practice
* XPCLocaleCallbacks are limited to the main thread.
*/
struct XPCLocaleCallbacks : public JSLocaleCallbacks {
XPCLocaleCallbacks() {
MOZ_COUNT_CTOR(XPCLocaleCallbacks);
// Disable the toLocaleUpper/Lower case hooks to use the standard,
// locale-insensitive definition from String.prototype. (These hooks are
// only consulted when JS_HAS_INTL_API is not set.) Since JS_HAS_INTL_API
// is always set, these hooks should be disabled.
localeToUpperCase = nullptr;
localeToLowerCase = nullptr;
localeCompare = nullptr;
localeToUnicode = nullptr;
// It's going to be retained by the ObserverService.
RefPtr<XPCLocaleObserver> locObs = new XPCLocaleObserver();
locObs->Init();
}
~XPCLocaleCallbacks() {
AssertThreadSafety();
MOZ_COUNT_DTOR(XPCLocaleCallbacks);
}
/**
* Return the XPCLocaleCallbacks that's hidden away in |rt|. (This impl uses
* the locale callbacks struct to store away its per-context data.)
*/
static XPCLocaleCallbacks* This(JSRuntime* rt) {
// Locale information for |cx| was associated using xpc_LocalizeContext;
// assert and double-check this.
const JSLocaleCallbacks* lc = JS_GetLocaleCallbacks(rt);
MOZ_ASSERT(lc);
MOZ_ASSERT(lc->localeToUpperCase == nullptr);
MOZ_ASSERT(lc->localeToLowerCase == nullptr);
MOZ_ASSERT(lc->localeCompare == nullptr);
MOZ_ASSERT(lc->localeToUnicode == nullptr);
const XPCLocaleCallbacks* ths = static_cast<const XPCLocaleCallbacks*>(lc);
ths->AssertThreadSafety();
return const_cast<XPCLocaleCallbacks*>(ths);
}
private:
void AssertThreadSafety() const {
NS_ASSERT_OWNINGTHREAD(XPCLocaleCallbacks);
}
NS_DECL_OWNINGTHREAD
};
bool xpc_LocalizeRuntime(JSRuntime* rt) {
// We want to assign the locale callbacks only the first time we
// localize the context.
// All consequent calls to this function are result of language changes
// and should not assign it again.
const JSLocaleCallbacks* lc = JS_GetLocaleCallbacks(rt);
if (!lc) {
JS_SetLocaleCallbacks(rt, new XPCLocaleCallbacks());
}
// Set the default locale.
// Check a pref to see if we should use US English locale regardless
// of the system locale.
if (Preferences::GetBool("javascript.use_us_english_locale", false)) {
return JS_SetDefaultLocale(rt, "en-US");
}
// No pref has been found, so get the default locale from the
// regional prefs locales.
AutoTArray<nsCString, 10> rpLocales;
LocaleService::GetInstance()->GetRegionalPrefsLocales(rpLocales);
MOZ_ASSERT(rpLocales.Length() > 0);
return JS_SetDefaultLocale(rt, rpLocales[0].get());
}
void xpc_DelocalizeRuntime(JSRuntime* rt) {
const XPCLocaleCallbacks* lc = XPCLocaleCallbacks::This(rt);
JS_SetLocaleCallbacks(rt, nullptr);
delete lc;
}